<!-- 下拉选择器组件分装 -->
<template>
  <div>
    <!-- :hide-on-click="!allOptions.multiple"  -->
    
    <el-dropdown class="drop_down_input" ref="selectDown" :class="[allOptions.size == 'mini'? 'el-input--mini':(allOptions.size == 'small'?'el-input--small':'el-input--medium')]" trigger="click" :disabled="allOptions.disabled || false" :placement="allOptions.placement || 'bottom-start'" @visible-change="toggleClick">
      <!-- 选择框 -->
      <div class=" el-input__inner select_wrap" :class="{clearBtn: multipleSelection.length > 0}">
        <div class="input_left"></div>
        <div class="input_center" :class="{'margin_right_position': allOptions.collapseTags && multipleSelection.length > allOptions.collapseTags}">
          <template v-if="allOptions.collapseTags">
            <el-tag v-for="(item,index) in multipleSelection.filter((it,idx) => {return idx < parseInt(allOptions.collapseTags)})" :key="index" closable type="danger" style="margin-right: 5px" @close="colseSelectItem(item,index)"> {{item[allOptions.label]}}</el-tag>
          </template>
          <template v-else>
            <el-tag v-for="(item,index) in multipleSelection" :key="index" closable type="danger" style="margin-right: 5px" @close="colseSelectItem(item,index)"> {{item[allOptions.label]}} </el-tag>
          </template>
        </div>
        <el-tag style="margin-right: 25px" v-if="allOptions.collapseTags && multipleSelection.length > allOptions.collapseTags">{{multipleSelection.length < 99? `+${multipleSelection.length}`: `99+`}}</el-tag>
        <div class="el-input__suffix el-input__suffix-inner el-input__icon el-icon-arrow-down" :class="{'rotate_right': dropDownStatus}" @click.stop="clearAllSelect"></div>
      </div>
      <!-- 下拉框 -->
      <el-dropdown-menu slot="dropdown" class="drop_down_box">
        <el-row class="search_box">
          <el-input :size="allOptions.size" v-model="keyword" :placeholder="`请输入${allOptions.placeholder || ''}`" @keydown.enter.native.stop="searchClick"></el-input>
          <el-button type="primary" @click="searchClick">搜 索</el-button>
          <el-button type="success">清 空</el-button>
        </el-row>
        <el-row>
          <u-table :row-key="allOptions.key" :row-id="allOptions.key" :size="allOptions.size || 'mini'" ref="multipleTable" :height="initTableHeight" :data="tableData" :stripe="allOptions.stripe || true" :border="allOptions.border || true" :tooltip-effect="allOptions.tooltipEffect || 'dark'" style="width: 100%" selectTrClass="selectTr" :record-table-select="true" @selection-change="handleSelectionChange" @row-click="selectRow" :pagination-show="true" :total="allPage.total" :page-size="allPage.pageSize" :current-page="allPage.currentPage" :page-sizes="allPage.pageSizes ||[10,20,50,100,200,500]" @handlePageSize="handlePageSize">
            <template slot="empty">
              <el-empty description="暂无数据" :image-size="100" class="table_empty"></el-empty>
            </template>
            <u-table-column :reserve-selection="true" v-if="allOptions.multiple || false" type="selection" fixed></u-table-column>
            <u-table-column v-for="(item,index) in showField" :key="index" :prop="item.prop" :label="item.label" :width="item.width" :show-overflow-tooltip="true" :fixed="item.fixed || false"></u-table-column>
          </u-table>
        </el-row>
      </el-dropdown-menu>
    </el-dropdown>
  </div>
</template>

<script>
import { Input } from 'element-ui'

/**
 * requestFun    Function请求函数
 * options = {
 *  collapseTags String| number 是否折叠标签
 *  formatKey:   String  绑定key 的方法  Array 或 String
 *  key:         string  绑定的key
 *  label:         string  绑定的label
 *  placeholder: string  提示语句
 *  clearable    Boolean 是否显示清除按钮
 *  multiple:    Boolean 是否多选，关联是否点击下拉框就隐藏属性
 *  disabled:    Boolean 是否禁用 默认 false
 *  placement:   string  菜单弹出位置 默认 bottom-start
 *  search:      Object  搜索条件 
 *  size:        string  输入框尺寸 默认mini
 * }
 * searchOption = {
 *  prop:       String 收索的字段
 *  label:      string 收索的字段名称
 *  placeholder String 提示
 * }
 * showField =[ Array 展示字段
 *  {prop:'',label: '',width:''},
 * ]
 *  returnField = ['id','name'] 设置返回的 字段对象 如 返回  {id: [1,2,3],name: ['qwe','asd','zxc'],its:[{id: 1,name: 'qwe'},{id: 2,name: 'asd'},{id: 3,name: 'zxc'}]}
 *  pageOption  Object 分页配置 :page-option="{total: page.total, pageSize: page.page.Size, currentPage: page.currentPage}"
 * 
 */
export default {
  props: {
    value: { type: String | Array, request: true }, //双向绑定属性
    options: { type: Object, default() { return {} } },
    requestFun: { type: Function },
    showField: { type: Array, request: true },
    returnField: { type: Array, default() { return [] } },
    pageOption: { type: Object, default() { return { total: 0, currentPage: 1, pageSize: 20 }}}
  },
  watch: {
    value: {
      handler(newValue, oldValue) {
        console.log(newValue, 'newValue')
        if (!newValue) return
        newValue = this.conversionValue(newValue)// 转成字符串数组
        // this.requestFun()
        this.formateSelectData(newValue)//初始化默认选中的数据
        this.returnData()
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
    allOptions() {
      return { size: 'mini', formatKey: 'String', ...this.options }
    },
    allPage() {
      return {...this.page,...this.pageOption}
    }
  },
  data() {
    return {
      table_height: '',
      dropDownStatus: false,
      keyword: "", //收索条件
      showcolumn: "", //要显示的列
      search: {}, //
      tableData: [{ id: 1, name: "张三", sex: "男" }, { id: 2, name: "李四", sex: "女" }],
      tableData1: [{ id: 1, name: "张三", sex: "男" }, { id: 2, name: "李四", sex: "女" }, { id: 5, name: "张三", sex: "男" }, { id: 6, name: "张三", sex: "男" },],
      tableData2: [{ id: 3, name: "3", sex: "女" }, { id: 4, name: "4", sex: "女" }, { id: 7, name: "张三", sex: "男" }, { id: 8, name: "张三", sex: "男" },],
      page: {//分页
        total: 8,
        currentPage: 1,
        pageSize: 2,

      },
      initTableHeight: 0,
      //多选
      multipleSelection: []
    }
  },
  methods: {
    //字符数组 字符串  转换成 字符串数组
    conversionValue(value) {
      if (typeof value == 'string') {//字符串的形式
        value = value.split(',')
      }
      return value.map(item => { return String(item) })
    },

    //点击某行
    selectRow(row, column, event) {
      if (!this.allOptions.multiple) return;
      console.log('点击某行', row, column, event)
      this.$refs.multipleTable.toggleRowSelection([{ row: row }])//切换选中

    },
    //选中监听事件
    handleSelectionChange(val) {
      console.log('监听事件多选返回子项对象数组：', val, this.allOptions)
      this.multipleSelection = val;
      let arr = this.multipleSelection.map(item => item[this.allOptions.key])
      this.allOptions.formatKey == 'String' ? this.$emit('input', arr.join(',')) : this.$emit('input', arr)
    },
    //处理返回的数据
    returnData() {
      if (!this.returnField.length) return { its: this.multipleSelection }
      let obj = {}
      this.returnField.forEach(item => {
        this.multipleSelection.forEach(it => {
          if (obj[item]) {
            obj[item].push(it[item])
          } else {
            obj[item] = [it[item]]
          }
        })
      })
      obj.its = this.multipleSelection
      console.log('处理返回的数据', obj)
    },


    //切换下拉显示隐藏
    async toggleClick(value) {//显示true,隐藏false
      this.dropDownStatus = value
      console.log(value)
      // if (value) {
      //   let tableData = await this.requestFun()
      // } else {

      // }

    },
    //初始化默认选中的数据
    formateSelectData(value) {
      console.log('初始化默认选中的数据', value)
      this.$nextTick(() => {
        let arr = []
        this.tableData.forEach(item => {
          if (value.includes(String(item[this.allOptions.key]))) {
            arr.push({ row: item, selected: true })
          }
        })
        this.$refs.multipleTable.toggleRowSelection(arr)
      })
    },
    //清除全部选中的数据
    clearAllSelect($event) {
      let arr = this.multipleSelection.map(item => { return { row: item, selected: false } })
      this.$refs.multipleTable.toggleRowSelection(arr)
    },
    //关闭选中的标签
    colseSelectItem(item, index) {
      console.log('关闭选中的标签', item, index)
      this.multipleSelection.forEach(it => {
        if (it[this.allOptions.key] == item[this.allOptions.key]) {
          this.$refs.multipleTable.toggleRowSelection([{ row: it, selected: false }])
        }
      })
    },
    //搜索 查询
    searchClick($event) {
      console.log('搜索按钮点击事件: searchClick',';搜索条件值：',this.keyword)
      $event.preventDefault()
      this.$emit('searchClick', this.keyword)
    },
    // 分页事件
    handlePageSize({size, page}) {
      console.log('触发的分页事件：handlePageSize;','传入的参数：',{size, page})
      this.$emit('handlePageSize',{size, page})
      this.page.currentPage = page
      this.page.pageSize = size
      if (page == 1) {
        this.tableData = this.tableData1
      } else {
        this.tableData = this.tableData2
      }
      this.$refs.selectDown.show()
      console.log('分页变化：', page)
    },
    //清空搜索条件
    resetClick() {
      this.query = {}
      this.onLoad()
    },
    // initTableHeight() { this.$nextTick(() => {return 300}) }
  },
  created() { },
  mounted() {
    setTimeout(() => {
      this.initTableHeight = 300
      // console.log(this.$refs.multipleTable.setHeight, 'this.$refs.multipleTable.setHeight')
    }, 500);
  },
}
</script>

<style scoped lang="scss">
//输入框样式
.drop_down_input {
  width: 100%;
  cursor: pointer;

  &:hover {
  }
  .mini {
    height: 28px;
  }
  .select_wrap {
    padding: 3px;
    display: flex;
    align-items: center;
    &.clearBtn:hover {
      .el-icon-arrow-down::before {
        content: "\e78d";
      }
    }
    .input_left {
    }
    .input_center {
      &.margin_right_position {margin-right: 3px;}
      flex: 1;
      margin-right: 25px;
      scrollbar-width: none;
      -ms-overflow-style: none;
      line-height: 1.5;
      white-space: nowrap;
      overflow: auto;
    }
    .rotate_right {
      transform: rotate(-180deg);
    }
  }
}
::-webkit-scrollbar {
  display: none; /* Chrome Safari */
}

//size 样式
// .el-input--mini .el-input__inner{}

// 下拉框样式
.drop_down_box {
  padding: 0px;
  min-width: 300px;
  .el-button {
    width: unset !important;
  }
  .search_box {
    display: flex;
    .el-button {
      margin: 0;
    }
  }
}

// table 样式
/deep/ .avue-crud__menu {
  display: none;
}

// 无数据
.table_empty {
  padding: 0;
}
/deep/.el-table__empty-block {
  // align-content: center;
  height: 100%;
}
</style>
<style>
/* 选中样式 */
.selectTr td {
  background: #d5e4f4 !important;
}
/* 分页 */
.myPagination {
  padding: 0 !important;
}
</style>